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A Kinetic View of Statistical Physics by Pavel L.,Krapivsky

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2 Diffusion

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The random walk and its continuum limit of diffusion, or Brownian motion, lie at the heart of non-equilibrium statistical physics. The mechanism for Brownian motion1 is the repeated collisions experienced by a microscopic particle with molecules in the surrounding environment. The historical importance of Brownian motion is that it provided a strong (indirect) confirmation of the existence of atoms and molecules. Because of their ubiquity and utility, random walks (Fig. 2.1) and diffusion are arguably the most successful models of ...

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